Fatal error: Uncaught Error: Class "MediaWikiIntegrationTestCase" not found in /var/www/html/orian-wiki/extensions/VisualEditor/tests/phpunit/integration/DualParsoidClientTest.php:21 Stack trace: #0 {main} thrown in /var/www/html/orian-wiki/extensions/VisualEditor/tests/phpunit/integration/DualParsoidClientTest.php on line 21